Which mammal has the lowest heart rate?

The mammal with the lowest heart rate is the American shrew mole. Its heart rate is only about 5-10 beats per minute, which is the slowest of any mammal. These small animals are found in North America and are known for their remarkable ability to survive in low oxygen environments.

The shrew mole's low heart rate is a result of its adaptation to its environment. Its slow heart rate helps it conserve oxygen and energy, allowing it to survive in its underground burrows where oxygen levels are low. This is important because the shrew mole spends most of its time digging tunnels and hunting for insects underground.

Despite its slow heart rate, the shrew mole is still able to function normally. Its brain and other organs receive enough oxygen to function properly, and it is able to maintain a normal body temperature.